US9284896B2 - Method for maximizing microhybrid auto start-stop availability - Google Patents

Method for maximizing microhybrid auto start-stop availability Download PDF

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Publication number
US9284896B2
US9284896B2 US13/754,930 US201313754930A US9284896B2 US 9284896 B2 US9284896 B2 US 9284896B2 US 201313754930 A US201313754930 A US 201313754930A US 9284896 B2 US9284896 B2 US 9284896B2
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Prior art keywords
vehicle
battery
engine
starter motor
resistance
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US20140214309A1 (en
Inventor
Ravi Atluru
Chuck De Biasi
Xiangying Liu
Zeljko Deljevic
David Celinski
David Anthony Symonow
Eric Michael Rademacher
Kirk Pebley
Dave W. Linden
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Ford Global Technologies LLC
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Ford Global Technologies LLC
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Assigned to FORD GLOBAL TECHNOLOGIES, LLC reassignment FORD GLOBAL TECHNOLOGIES, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LUI, XIANGYING, ATLURI, RAVI, CELINSKI, DAVID, DE BIASI, CHUCK, DELJEVIC, ZELJKO, LINDEN, DAVE W., PEBLEY, KIRK, RADEMACHER, ERIC MICHAEL, SYMONOW, DAVID ANTHONY
Priority to DE102014201658.4A priority patent/DE102014201658A1/de
Priority to RU2014103303A priority patent/RU2633439C2/ru
Priority to CN201410044873.2A priority patent/CN103963777B/zh
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/0007—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using electrical feedback
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
    • B60W10/26—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18018—Start-stop drive, e.g. in a traffic jam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0803—Circuits or control means specially adapted for starting of engines characterised by means for initiating engine start or stop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
    • F02N11/0825—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode related to prevention of engine restart failure, e.g. disabling automatic stop at low battery state
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/10—Safety devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/023—Engine temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/04—Parameters used for control of starting apparatus said parameters being related to the starter motor
    • F02N2200/044—Starter current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/04—Parameters used for control of starting apparatus said parameters being related to the starter motor
    • F02N2200/046—Energy or power necessary for starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
    • F02N2200/061—Battery state of charge [SOC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
    • F02N2200/063—Battery voltage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems
    • Y02T10/48—

Definitions

  • Embodiments of the present disclosure generally relate to automotive vehicles, and, more specifically, to microhybrid vehicles equipped with auto Start-stop feature.
  • Microhybrid electric vehicles incorporate start stop systems, which automatically shut down the engine of the vehicle to minimize engine idling conditions when the vehicle is stationary, and restart the engine when the vehicle starts moving again. This substantially reduces the vehicle's fuel consumption, and emissions from the vehicle.
  • the start-stop technology is extremely advantageous when a vehicle is running under traffic jams conditions, or it frequently stops and spends significant time at the traffic signals.
  • the start-stop technology shuts down the engine when the driver presses the brake pedal or the clutch to stop the car.
  • the engine is restarted when the brake pedal is released (in case of automatic transmissions) and/or the clutch is depressed again (in case of vehicles incorporating manual transmission) prior to selecting the gear for moving the car.
  • the vehicle's engine may also restart if the electrical power demanded by one or more vehicle's subsystems, such as, the air conditioning system, is relatively higher.
  • Alternators are used in microhybrid vehicles to charge the battery, and to power the electrical systems of the vehicle when the engine is running.
  • the vehicle's alternator is also switched off, and the major sub-systems of the vehicle, including the infotainment system, the climate control system, etc., draw power from the battery of the vehicle for operation. Since the alternator shuts down in response to the shutting down of the vehicle's engine, the battery cannot be charged, and it starts draining, as the electrical subsystems draw power from the battery of the vehicle.
  • the engine may need to be restarted after a specific time, to avoid a condition where the operation of the electrical subsystems of the vehicle may be effected due to battery drainage and corresponding low electrical system voltage. This may occur in a situation where the vehicle's engine has been shut down by the auto start-stop system of the vehicle, for a relatively long time. Further, in a case where the battery of a vehicle drains to a certain minimum level, subsequent low electrical system voltage may cause undesired performance of the electrically driven subsystems.
  • a battery management module of the vehicle uses a fixed value of the inrush current the starter motor of the vehicle will draw, to determine availability of the engine start-stop feature.
  • the inrush current value at the starter motor of the vehicle' engine directly affects the electrical systems' voltage.
  • the battery management module uses a fixed programmed value for the starter motor inrush current, there may be certain neglected/unidentified cases where the battery of the vehicle may still have enough power, and the stop-start operation may be left unutilized or underutilized.
  • Other attempts to maximize the start-stop operation in a vehicle have also not been substantially successful so far.
  • the present disclosure provides a method for maximizing the availability of start-stop feature within a microhybrid electric vehicle, without affecting the operations of the electrical components of the vehicle, drawing power from the battery of the vehicle.
  • the present disclosure provides a method for maximizing the availability of start-stop mode of operation for a vehicle's engine.
  • the method includes measuring the electric current (load) drawn by a set of vehicle's electrical components, from the vehicle's battery.
  • the internal resistance of the battery of the vehicle is measured dynamically.
  • the method dynamically determines and records the resistance across the vehicles starter motor loop circuit, which includes the starter motor, solenoid and connected wiring.
  • the method calculates a closed-circuit voltage of the vehicle's battery using the current drawn by the set of electric components, the internal resistance of the battery, and the starter motor loop resistance. Based on the calculated closed-circuit voltage of the battery, the method carries out the start-stop operation for the engine of the vehicle, if the predicted closed circuit voltage is above a certain pre-determined value.
  • FIG. 1 is an electrical circuit representing a battery coupled to a set of electrical components and a starter motor of a vehicle, according to an embodiment of the present disclosure.
  • FIG. 2 illustrates an exemplary environment, depicting the components of a vehicle collaborating with each other, and being configured to maximize the availability of the start-stop feature within the vehicle.
  • FIG. 3 depicts a flowchart illustrating an exemplary method for maximizing the availability of start-stop operations for the engine of a vehicle, according to an embodiment of the present disclosure.
  • the current microhybrid vehicles in the automotive market are equipped with a start-stop feature for the vehicle's engine, and this feature shuts down the engine when the vehicle is nearly stationary.
  • the engine is restarted as the vehicle starts moving again. This minimizes the engine idling conditions, and therefore, reduces fuel consumption and emissions from the vehicle.
  • the electrical components of the vehicle including the climate control system, the infotainment system, the lighting system, etc., start drawing power from the vehicle's battery, and therefore, the battery may drain with time, if the engine is shut down for an extended period. In a case where the battery drains below a certain level, the operation of the electrical components of the vehicle may be affected.
  • the battery should supply a certain minimum voltage.
  • Many of the conventional start-stop systems within vehicles utilize a fixed programmed value for the inrush current at the starter motor coupled to the vehicle's engine, to minimize obstructions to proper functioning of vehicle's electrical components, while the start-stop operations are carried out. This approach may not ensure maximum availability of the start-stop feature.
  • the present disclosure is directed to a method for maximizing the availability of start-stop feature in a microhybrid vehicle, without affecting the operation of the vehicle's electrical components, such as the infotainment system, the climate control system, etc.
  • V B Closed-circuit voltage of the battery of the vehicle, i.e., the potential difference between the terminals of the battery.
  • R B Internal resistance of the battery.
  • R s Resistance across the vehicle's starter motor loop circuit, including the starter motor, the solenoid for the starter motor and the connected electrical wiring system.
  • I L Current (load) drawn from the battery by the electrical components of the vehicle.
  • R L Lumped resistance of the vehicle's electrical system, excluding the starter loop resistance (This lumped resistance is a non-ohmic resistance).
  • V OC Open circuit voltage between the terminals of the battery
  • the DC Voltage source 102 shown in the circuit represents the vehicle's battery.
  • the load drawn by the vehicle's electrical components from the battery is represented by I L .
  • such electrical components may include the climate control system, the infotainment system, the GPS system, the ignition system, headlights, etc.
  • the engine of the vehicle is placed in the auto-stop mode by the vehicle's start-stop system, such electrical components start drawing power from the vehicle's battery.
  • the battery starts draining.
  • the total load drawn by the different electrical components of the vehicle may vary, depending on the operating power of those components.
  • the value of I L may be much higher.
  • the average reference value of the load drawn by the electrical components of the vehicle i.e., I L
  • the value of I L may vary, based on the operating power required for the different electrical components of the vehicle.
  • V OC represents the open circuit voltage of the vehicle's battery, which is the potential difference between the terminals of the battery when the battery is not connected to any external circuit. Specifically, V OC corresponds to the case where none of the vehicle's electrical components are drawing power from the battery.
  • V B represents the closed-circuit voltage of the battery, when the vehicle's electrical systems are drawing power from the battery, i.e., the battery is connected to an external circuit.
  • the value of ‘V B ’ depends on parameters like the type and size of battery, the internal resistance of the battery, the number of cells provided within the battery, the current being drawn from the battery, the battery's temperature, etc.
  • the symbol ‘R B ’ in the shown circuit represents the internal resistance of the battery of the vehicle.
  • the battery is a rechargeable battery, configured to supply electrical energy to the electrical systems of the vehicle.
  • the battery is a conventional SLI (starting, lighting and ignition) battery for supplying power to the starter motor, the headlights and the backlights, the indicators, and the ignition system of the vehicle.
  • a typical example of such a battery may be a lead-acid battery, which is conventionally used in automotive vehicles.
  • a conventionally used automotive SLI battery includes a certain number of galvanic cells connected in series or parallel combination, to provide a desired amount of voltage to the vehicle's electrical systems.
  • a lead-acid SLI battery plates of lead, and separate plates of lead-oxide are submerged in an electrolyte solution containing sulphuric acid and water in certain proportions.
  • other automotive batteries may also be used instead of the lead-acid batteries.
  • the size of the battery may vary, depending on the type and size of the vehicle. In a case where the vehicle is a heavy truck or an SUV, two or more such batteries may be connected in series or in parallel to attain a specific voltage value for operating the electrical systems of the vehicle.
  • the battery's charge is used to supply power to electrical components/systems of the vehicle, and the charge gets restored within the battery during the engine's running conditions.
  • the value of the internal resistance ‘R B ’ may increase as the battery ages, i.e., grows older, due to continuous usage. For example, the value of ‘R B ’ for a new battery may be much lower than the value for a one year old battery.
  • the method of the present disclosure measures the internal resistance (R B ) of the battery during each engine restart event, for predicting the battery voltage (V B ) at the next engine restart event. For this, the state of charge (SOC) of the battery is continuously measured. Any suitable conventional method for measuring the battery's state of charge may be used.
  • the temperature of the battery is continuously measured through a temperature sensor, to track changes in the internal resistance of the battery (R B ).
  • the temperature sensor may be in thermal communication with the ambient air surrounding the battery of the vehicle.
  • one or more temperature sensors may also be coupled to the engine oil, or the coolant of the engine, to have an approximate value of the temperature of the battery. Specifically, once the temperature of the engine oil or the engine coolant is known, a calibrated lookup table may be used to estimate the internal temperature of the battery of the vehicle. Further, the temperature of the battery is obtained at regular instants, to incorporate any change in the internal resistance of the battery of the vehicle, while carrying out the method of the present disclosure.
  • the value ‘R S ’ in the circuit shown in FIG. 1 represents the resistance across the vehicle's starter motor loop circuit, which includes the starter motor, the solenoid for the starter motor, and the connected electrical wiring system.
  • the starter motor is an electric motor commonly used in automotive vehicles, and is coupled to the internal combustion engine of the vehicle.
  • the starter motor is configured to drive the engine during its operations. When the engine is started, the starter motor draws current from the battery of the vehicle, to start the engine, when a start switch of the vehicle is operated.
  • the starter motor loop circuit resistance (R S ) is measured at each restart event for the vehicle's engine, and is used to determine a predicted value for the voltage of the battery (V B ) at the next restart event for the engine.
  • the value of R s varies depending on the temperature/age of the starter motor, the loop wiring, the solenoid for the starter motor, connectors, etc.
  • Appropriate temperature sensors may be coupled to, and positioned in thermal communication with either or more of the engine oil, the engine coolant, the ambient air surrounding the starter motor, to determine the temperature of the loop circuit of the starter motor.
  • a dynamically calculated look-up table may be used to find the temperature of the starter motor loop circuit, and the connected components, from the detected temperature of the engine oil or the engine coolant. Further, the temperature of the air surrounding the starter loop circuit may also be an approximate measure of the temperature of the loop circuit. In certain embodiments, an average of the values of the temperature obtained through the look-up table, and the temperature of the ambient air surrounding the loop circuit may also be taken, to have a more precise estimation of the temperature of the loop circuit components.
  • the resistance of the loop circuit may be calculated using the coefficient of resistivity of the material of the loop circuit.
  • the current flowing through the starter motor loop circuit is denoted by I S , and is also the inrush current for the starter motor.
  • the method of the present disclosure for maximizing the availability of start-stop operations within a vehicle, continuously measures the voltage of the battery, i.e., V B , and ensures that the value of V B never goes below a pre-determined minimum value (V B, Min ), in order to prevent any obstructions in the operation of the electrical components of the vehicle.
  • V B, Min a pre-determined minimum value
  • the objective of the method is to maintain V B above 7 Volts when the engine of the vehicle is brought under auto-stop condition by the start-stop system of the vehicle.
  • the pre-determined minimum value for V B i.e., V B, Min , or V threshold may be different in certain embodiments, depending on the operating power required for the electrical components of the vehicle.
  • I B Current delivered by the battery
  • I L Current (load) drawn by the electrical systems of the vehicle.
  • V B I L + V B R S ( ii )
  • V B V OC ⁇ I B R B (iii)
  • V OC Open Circuit voltage of the battery.
  • V B V OC - [ I L + V B R S ] ⁇ R B ( iv ) Solving Eq. (iv) for V B , we have:
  • V B V OC - I L ⁇ R B 1 + R B / R S ( v )
  • Eq. (v) is used by the method of the present disclosure, to continuously calculate the value of V B , i.e., the voltage of the battery of the vehicle.
  • V B the voltage of the battery of the vehicle.
  • This value is used to determine whether the engine of the vehicle can be stopped after it is in Auto-stop mode, without obstructing the functionality of the electrical systems of the vehicle. Specifically, after the engine of the vehicle is in auto-stop mode, if the Voltage of the battery (V B ) falls below the pre-determined minimum value (V B, Min. ), a decision is made to restart the engine. This maximizes the availability of the start-stop operation in the vehicle.
  • the value of the load (I L ) extracted by the electrical systems of the vehicle is continuously determined.
  • the value of I s is calculated by knowing the dynamic values of Rs and R B .
  • the optimized value of I s used to predict V B or V Threshold , to maximizing the availability of start-stop feature, and to ultimately improve fuel economy.
  • FIG. 2 is an exemplary environment, depicting the modules/components of a vehicle 200 collaborating with each other, for maximizing the availability of start-stop operations within a vehicle.
  • the vehicle 200 is a microhybrid electric vehicle, equipped with the auto start-stop technology for the engine. Further, the vehicle 200 may be a car, a Sports Utility Vehicle, a pick-up truck, etc.
  • a battery 202 is coupled to an electrical system 214 of the vehicle 200 .
  • the battery 202 is configured to supply power to the electrical system 214 of the vehicle, especially in cases where the engine 222 of the vehicle is stopped.
  • the electrical system 214 may include components like the air-conditioning system, the music system, the GPS system and the ignition system of the vehicle 200 .
  • the battery 202 may be any suitable battery conventionally used in modern automotive vehicles, such as, a lead acid battery or AGM or any other technology. Further, it is contemplated that multiple such batteries 202 can be arranged in a series or parallel combination, to achieve a desired voltage value for igniting and starting the engine, and for delivering power to the electrical system 214 .
  • a starter motor 206 is coupled to the battery 202 and the engine 222 of the vehicle 200 , and derives power from the battery 202 of the vehicle.
  • the starter motor 206 is configured to rotate the engine 222 of the vehicle, to initiate the engine's operation under its own power. Further, the starter motor 206 may either use a permanent magnet, or may also be a series-parallel wound direct current electric motor with a starter solenoid mounted on it.
  • the starter motor 206 draws a specific amount of current (i.e., the starter motor inrush current I S ) to drive the engine 222 of the vehicle. Therefore, when the engine 222 is started, the battery 202 must have a certain minimum voltage, to initiate ignition of the engine 222 .
  • An alternator 210 is coupled to the engine 222 and the battery 202 .
  • the alternator 210 may either use a permanent magnetic field (i.e., a magneto) to generate alternative current, or may also have a stationary armature coil placed in a rotating magnetic field, to generate electric current. Coupled to the battery 202 , the alternator 210 charges the battery 202 when the engine 222 is running, and also powers the electrical system 214 of the vehicle 200 under the engine's running conditions.
  • Temperature detection sensors 226 ( a ), 226 ( b ) and 226 ( c ) are coupled to the different components of the vehicle.
  • the temperature sensor 226 ( a ) may be in thermal communication with the battery 202 , for measuring the temperature of the battery 202 .
  • temperature sensor 226 ( b ) is coupled to the starter motor 206 , and is configured to measure the temperature of the starter motor loop circuit.
  • the temperature sensor 226 ( b ) may be in thermal communication with the air surrounding one or more of the components of the loop circuit for the starter motor 206 , to roughly measure the temperature of the loop circuit. That value of temperature detected by the sensor 226 ( b ) is used to continuously evaluate the resistance of the starter motor loop circuit, as mentioned earlier.
  • the temperature sensor 226 ( c ) is coupled to the engine 222 of the vehicle, and is configured to measure the temperature of the engine coolant or the engine oil.
  • the temperature value detected by the temperature sensor 226 ( c ) can be used for calibration through a look-up table, to estimate the temperature of the starter motor loop circuit.
  • a battery management module 218 is coupled to each of the temperature sensors 226 ( a )- 226 ( c ), and it continuously records the temperature values detected by these sensors.
  • the battery management module 218 may have a processor (not shown), which executes a pre-determined algorithm for calculating the voltage of the battery dynamically.
  • the battery management module 218 uses inputs from the temperature sensors 226 ( a )- 226 ( c ), to evaluate the instantaneous values of the resistance of the starter motor loop circuit (R S ), and the internal resistance of the battery 202 of the vehicle (R B ). On determining these values, the battery module 218 uses eventual steps of the algorithm, incorporating Eqs.
  • the battery management module 218 may generate signals indicating that a start-stop operation for the engine 222 of the vehicle can be carried out.
  • the battery management module 218 After an auto-stop operation for the engine 222 of the vehicle has been carried out, if the instantaneous voltage of the battery (V B ) of the vehicle falls below the pre-determined minimum value (V B, Min. ), the battery management module 218 generates signals for restarting the engine 222 of the vehicle.
  • FIG. 3 is a flowchart, illustrating an exemplary method for maximizing the utility of start-stop operations as implemented within a vehicle, according to another embodiment of the present disclosure.
  • the lumped resistance of the vehicle's electrical system (R L ), excluding the starter loop resistance, is calculated.
  • R L The value of R L is given by:
  • V B1 is the voltage of the battery when the electrical systems are drawing load from the battery, and the starter motor is not activated
  • I L1 is the value of current drawn by the electrical systems of the vehicle when the starter motor for the engine is not activated.
  • the current drawn by the electrical systems of the vehicle (I L2 ) is calculated, when the starter motor for the engine of the vehicle has been activated.
  • the voltage of the battery of the vehicle changes to V B2 , and hence, a different value (I L2 ) of the current is drawn by the electrical systems, which is given by:
  • the method calculates the resistance of the starter motor loop circuit (R S ) using the value of the current I s obtained from Eqn. (vii), as:
  • the method updates the value of R s obtained from Eqn. (viii) above, in a look-up table.
  • the look-up table may have a set of pre-stored values of the resistance of the starter motor loop circuit, based on factors like the ambient temperature of the battery, and the temperature of the engine oil/coolant. Each time the value of R s is calculated, the look-up table is updated, and the pre-stored values are incorporated with the new calculated value of R s , to have a more accurate and precise data.
  • the method calculates and notes down both a mean value for R s , i.e., R s ( ⁇ ), as shown in step 318 ( a ), and a deviation value for R s ( ⁇ ), as shown in step 318 ( b ), to incorporate any changes in the value of R s .
  • the value of R s may then be presumed to lie within the range R s ( ⁇ )+/ ⁇ R s ( ⁇ ).
  • a battery management module of the vehicle may have a processor configured to continuously update the look-up table, to obtain real time precise value of R s .
  • the method calculates the inrush current value for the starter motor loop circuit (I s2 ), when the starter motor for the engine of the vehicle is in the activated state.
  • a threshold value for the voltage of the battery (V B, Threshold ) is used to calculate I s2 as:
  • the predetermined threshold value for the voltage of the battery (V B, Threshold ), is about seven volts, to avoid obstructions in the operating conditions of the different electrical systems of the vehicle, when the engine stop-start operations are carried out.
  • V B, Threshold the predetermined threshold value for the voltage of the battery
  • the value of V B, Threshold may vary in certain embodiments, based on factors like the power required to operate the different electrical systems of the vehicle.
  • the battery monitoring system of the vehicle computes the value of a quantity WCC, which has the units of time.
  • the computed value of the quantity WCC is compared with a pre-determined threshold time value (T Threshold ). In a case where the value of WCC exceeds T Threshold , the start-stop operation for the engine of the vehicle is initiated at step 334 . Else, the method goes back to step 302 , and keeps on tracking the values of the different parameters, as aforementioned, to maximize the availability of the start-stop operations in the vehicle.
  • the method of the present disclosure is implementable and advantageous for any microhybrid electric vehicles equipped with the start-stop feature, including cars, SUVs, pick-up trucks, etc.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
US13/754,930 2013-01-31 2013-01-31 Method for maximizing microhybrid auto start-stop availability Active 2034-08-11 US9284896B2 (en)

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US13/754,930 US9284896B2 (en) 2013-01-31 2013-01-31 Method for maximizing microhybrid auto start-stop availability
DE102014201658.4A DE102014201658A1 (de) 2013-01-31 2014-01-30 Verfahren zum Maximieren von Mikrohybrid-Auto-Start-Stopp-Verfügbarkeit
RU2014103303A RU2633439C2 (ru) 2013-01-31 2014-01-31 Способ обеспечения максимального использования старт-стопной системы для микрогибридных автомобилей
CN201410044873.2A CN103963777B (zh) 2013-01-31 2014-02-07 使微混合动力汽车的启动/停止可用性最大化的方法

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160290270A1 (en) * 2013-11-26 2016-10-06 Toyota Jidosha Kabushiki Kaisha Control system and control method of vehicle
US20180058413A1 (en) * 2016-08-29 2018-03-01 GM Global Technology Operations LLC No-start diagnostics for powertrain with enabled starter
US10059328B2 (en) 2016-08-11 2018-08-28 Ford Global Technologies, Llc System and method to control battery current during rolling stop-start events
US10266134B2 (en) 2017-06-02 2019-04-23 Ford Global Technologies, Llc Vehicle accessory power management
US20200309080A1 (en) * 2019-04-01 2020-10-01 Ford Global Technologies, Llc System and method for controlling vehicle stop-start function based on measured and predicted cranking voltages and adaptive adjustment of circuit resistance
US11585307B2 (en) * 2019-04-01 2023-02-21 Ford Global Technologies, Llc System and method for controlling vehicle stop-start function based on measured and predicted cranking voltages and adaptive adjustment of circuit resistance

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10458382B2 (en) 2015-04-15 2019-10-29 Ford Global Technologies, Llc Auto stop parameter threshold adjustment
US20170043665A1 (en) * 2015-08-14 2017-02-16 Ford Global Technologies, Llc Controlling heated windshield load to allow and maximize stop-start availability
US10363933B2 (en) 2016-03-03 2019-07-30 Ford Global Technologies, Llc Smart driver presence strategy for police and commercial vehicles to increase auto-stop engine availability
US10408183B2 (en) * 2017-03-07 2019-09-10 Ford Global Technologies, Llc Methods and systems for improving engine starter durability for a stop/start vehicle
CN111762159B (zh) * 2019-03-14 2023-01-17 中国第一汽车股份有限公司 一种48v微混系统双离合器变速器启停协调控制方法
JP7192648B2 (ja) * 2019-05-07 2022-12-20 株式会社デンソー 電源装置、電源システム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130020994A1 (en) * 2011-07-20 2013-01-24 Ford Global Technologies, Llc Method for determining a charge acceptance, and method for charging a rechargeable battery
US20130179018A1 (en) * 2012-01-05 2013-07-11 Koji Yamamoto Control apparatus for vehicle
US20140121865A1 (en) * 2012-10-29 2014-05-01 Deere & Company Methods and Apparatus to Control Motors
US9014889B2 (en) * 2011-08-03 2015-04-21 Toyota Jidosha Kabushiki Kaisha Hybrid vehicle and method of controlling hybrid vehicle

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4499810B2 (ja) * 2008-05-28 2010-07-07 株式会社日本自動車部品総合研究所 車載バッテリの状態推定装置
JP2010270747A (ja) * 2009-04-23 2010-12-02 Denso Corp エンジン自動制御装置
JP5449014B2 (ja) * 2010-05-07 2014-03-19 本田技研工業株式会社 発動発電機の自動起動停止装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130020994A1 (en) * 2011-07-20 2013-01-24 Ford Global Technologies, Llc Method for determining a charge acceptance, and method for charging a rechargeable battery
US9014889B2 (en) * 2011-08-03 2015-04-21 Toyota Jidosha Kabushiki Kaisha Hybrid vehicle and method of controlling hybrid vehicle
US20130179018A1 (en) * 2012-01-05 2013-07-11 Koji Yamamoto Control apparatus for vehicle
US20140121865A1 (en) * 2012-10-29 2014-05-01 Deere & Company Methods and Apparatus to Control Motors

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160290270A1 (en) * 2013-11-26 2016-10-06 Toyota Jidosha Kabushiki Kaisha Control system and control method of vehicle
US9790884B2 (en) * 2013-11-26 2017-10-17 Toyota Jidosha Kabushiki Kaisha Control system and control method of vehicle
US10059328B2 (en) 2016-08-11 2018-08-28 Ford Global Technologies, Llc System and method to control battery current during rolling stop-start events
US20180058413A1 (en) * 2016-08-29 2018-03-01 GM Global Technology Operations LLC No-start diagnostics for powertrain with enabled starter
US10215148B2 (en) * 2016-08-29 2019-02-26 GM Global Technology Operations LLC No-start diagnostics for powertrain with enabled starter
US10266134B2 (en) 2017-06-02 2019-04-23 Ford Global Technologies, Llc Vehicle accessory power management
US20200309080A1 (en) * 2019-04-01 2020-10-01 Ford Global Technologies, Llc System and method for controlling vehicle stop-start function based on measured and predicted cranking voltages and adaptive adjustment of circuit resistance
US11585307B2 (en) * 2019-04-01 2023-02-21 Ford Global Technologies, Llc System and method for controlling vehicle stop-start function based on measured and predicted cranking voltages and adaptive adjustment of circuit resistance

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